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Thread: conjugate

  1. February 15th 2009, 11:57 PM #1
    salam
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    conjugate


    2√3
    √5+2 √6

    Soorry about not using latex
    buh i need help again...
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  2. February 16th 2009, 12:02 AM #2
    Jameson
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    \frac{2\sqrt{3}}{\sqrt{5}+2\sqrt{6}}

    The conjugate of a+b is simply a-b. What's nice about this product is you will get a^2-b^2, which eliminates square roots. Multiply the numerator and denominator by the conjugate of the denominator.
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  3. February 16th 2009, 12:18 AM #3
    salam
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    could u please show me the working to it
    so, express with rational denominator
    thanks
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  4. February 16th 2009, 01:06 AM #4
    Jameson
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    Quote Originally Posted by salam View Post
    could u please show me the working to it
    so, express with rational denominator
    thanks
    \frac{2\sqrt{3}}{\sqrt{5}+2\sqrt{6}} \times \frac{\sqrt{5}-2\sqrt{6}}{\sqrt{5}-2\sqrt{6}}

    Like I said (a+b)(a-b)=a^2-b^2. What a and b are should be obvious. Take it from here.
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« [SOLVED] Surds...express with rational denominator | Money / Investment stuff. »

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